Katherine Williamson, MD
NPI 1982916375 · Pediatrics Physician · Lake Forest, CA
Katherine Williamson, MD is a Pediatrics Physician provider in Lake Forest, CA (NPI 1982916375).
Provider details
- NPI number
- 1982916375
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- A112985 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
16 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$482 across 21 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-07-14
- Last updated
- 2017-01-17
Frequently asked questions
- What is Katherine Williamson's NPI number?
- Katherine Williamson's National Provider Identifier (NPI) is 1982916375, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Williamson's specialty?
- Katherine Williamson is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine Williamson located?
- Katherine Williamson's practice location on file with NPPES is 23321 El Toro Rd, Lake Forest, CA 92630-4825.
- What is Katherine Williamson's phone number?
- The practice phone number listed in the NPPES registry for Katherine Williamson is (949) 388-1798.
- Is Katherine Williamson's NPI active?
- Yes — Katherine Williamson's NPI (1982916375) is active in the NPPES registry as of the last update on 2017-01-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.